1 /*
2 * Copyright (c) 2011, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 package jdk.vm.ci.hotspot;
24
25 import static java.util.Objects.requireNonNull;
26 import static jdk.vm.ci.hotspot.CompilerToVM.compilerToVM;
27 import static jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.runtime;
28 import static jdk.vm.ci.hotspot.HotSpotVMConfig.config;
29 import static jdk.vm.ci.hotspot.UnsafeAccess.UNSAFE;
30
31 import java.lang.annotation.Annotation;
32 import java.lang.reflect.Array;
33 import java.lang.reflect.Constructor;
34 import java.lang.reflect.Method;
35 import java.lang.reflect.Modifier;
36 import java.nio.ByteOrder;
37 import java.util.ArrayList;
38 import java.util.Arrays;
39 import java.util.HashMap;
40
41 import jdk.vm.ci.common.JVMCIError;
42 import jdk.vm.ci.meta.Assumptions.AssumptionResult;
43 import jdk.vm.ci.meta.Assumptions.ConcreteMethod;
44 import jdk.vm.ci.meta.Assumptions.ConcreteSubtype;
45 import jdk.vm.ci.meta.Assumptions.LeafType;
46 import jdk.vm.ci.meta.Assumptions.NoFinalizableSubclass;
47 import jdk.vm.ci.meta.Constant;
48 import jdk.vm.ci.meta.JavaConstant;
49 import jdk.vm.ci.meta.JavaKind;
50 import jdk.vm.ci.meta.JavaType;
51 import jdk.vm.ci.meta.ModifiersProvider;
52 import jdk.vm.ci.meta.ResolvedJavaField;
53 import jdk.vm.ci.meta.ResolvedJavaMethod;
54 import jdk.vm.ci.meta.ResolvedJavaType;
55
56 /**
57 * Implementation of {@link JavaType} for resolved non-primitive HotSpot classes.
58 */
59 final class HotSpotResolvedObjectTypeImpl extends HotSpotResolvedJavaType implements HotSpotResolvedObjectType, MetaspaceWrapperObject {
60
61 /**
62 * The Java class this type represents.
63 */
64 private final Class<?> javaClass;
65 private HashMap<Long, HotSpotResolvedJavaField> fieldCache;
66 private HashMap<Long, HotSpotResolvedJavaMethodImpl> methodCache;
67 private HotSpotResolvedJavaField[] instanceFields;
68 private HotSpotResolvedObjectTypeImpl[] interfaces;
69 private HotSpotConstantPool constantPool;
70 final HotSpotJVMCIMetaAccessContext context;
71 private HotSpotResolvedObjectType arrayOfType;
72
73 /**
74 * Gets the JVMCI mirror for a {@link Class} object.
75 *
76 * @return the {@link HotSpotResolvedJavaType} corresponding to {@code javaClass}
77 */
78 static HotSpotResolvedObjectTypeImpl fromObjectClass(Class<?> javaClass) {
79 return (HotSpotResolvedObjectTypeImpl) runtime().fromClass(javaClass);
80 }
81
82 /**
83 * Gets the JVMCI mirror from a HotSpot type. Since {@link Class} is already a proxy for the
84 * underlying Klass*, it is used instead of the raw Klass*.
85 *
86 * Called from the VM.
87 *
88 * @param javaClass a {@link Class} object
89 * @return the {@link ResolvedJavaType} corresponding to {@code javaClass}
90 */
91 @SuppressWarnings("unused")
92 private static HotSpotResolvedObjectTypeImpl fromMetaspace(Class<?> javaClass) {
93 return fromObjectClass(javaClass);
94 }
95
96 /**
97 * Creates the JVMCI mirror for a {@link Class} object.
98 *
99 * <p>
100 * <b>NOTE</b>: Creating an instance of this class does not install the mirror for the
101 * {@link Class} type. Use {@link #fromObjectClass(Class)} or {@link #fromMetaspace(Class)}
102 * instead.
103 * </p>
104 *
105 * @param javaClass the Class to create the mirror for
106 * @param context
107 */
108 HotSpotResolvedObjectTypeImpl(Class<?> javaClass, HotSpotJVMCIMetaAccessContext context) {
109 super(getSignatureName(javaClass));
110 this.javaClass = javaClass;
111 this.context = context;
112 assert getName().charAt(0) != '[' || isArray() : getName();
113 }
114
115 /**
116 * Returns the name of this type as it would appear in a signature.
117 */
118 private static String getSignatureName(Class<?> javaClass) {
119 if (javaClass.isArray()) {
120 return javaClass.getName().replace('.', '/');
121 }
122 return "L" + javaClass.getName().replace('.', '/') + ";";
123 }
124
125 /**
126 * Gets the metaspace Klass for this type.
127 */
128 long getMetaspaceKlass() {
129 if (HotSpotJVMCIRuntime.getHostWordKind() == JavaKind.Long) {
130 return UNSAFE.getLong(javaClass, config().klassOffset);
131 }
132 return UNSAFE.getInt(javaClass, config().klassOffset) & 0xFFFFFFFFL;
133 }
134
135 public long getMetaspacePointer() {
136 return getMetaspaceKlass();
137 }
138
139 @Override
140 public int getModifiers() {
141 if (isArray()) {
142 return (getElementalType().getModifiers() & (Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED)) | Modifier.FINAL | Modifier.ABSTRACT;
143 } else {
144 return getAccessFlags() & ModifiersProvider.jvmClassModifiers();
145 }
146 }
147
148 public int getAccessFlags() {
149 HotSpotVMConfig config = config();
150 return UNSAFE.getInt(getMetaspaceKlass() + config.klassAccessFlagsOffset);
151 }
152
153 @Override
154 public HotSpotResolvedObjectType getArrayClass() {
155 if (arrayOfType == null) {
156 arrayOfType = fromObjectClass(Array.newInstance(mirror(), 0).getClass());
157 }
158 return arrayOfType;
159 }
160
161 @Override
162 public ResolvedJavaType getComponentType() {
163 Class<?> javaComponentType = mirror().getComponentType();
164 return javaComponentType == null ? null : runtime().fromClass(javaComponentType);
165 }
166
167 @Override
168 public AssumptionResult<ResolvedJavaType> findLeafConcreteSubtype() {
169 if (isLeaf()) {
170 // No assumptions are required.
171 return new AssumptionResult<>(this);
172 }
173 HotSpotVMConfig config = config();
174 if (isArray()) {
175 ResolvedJavaType elementalType = getElementalType();
176 AssumptionResult<ResolvedJavaType> elementType = elementalType.findLeafConcreteSubtype();
177 if (elementType != null && elementType.getResult().equals(elementalType)) {
178 /*
179 * If the elementType is leaf then the array is leaf under the same assumptions but
180 * only if the element type is exactly the leaf type. The element type can be
181 * abstract even if there is only one implementor of the abstract type.
182 */
183 AssumptionResult<ResolvedJavaType> result = new AssumptionResult<>(this);
184 result.add(elementType);
185 return result;
186 }
187 return null;
188 } else if (isInterface()) {
189 HotSpotResolvedObjectTypeImpl implementor = getSingleImplementor();
190 /*
191 * If the implementor field contains itself that indicates that the interface has more
192 * than one implementors (see: InstanceKlass::add_implementor).
193 */
194 if (implementor == null || implementor.equals(this)) {
195 return null;
196 }
197
198 assert !implementor.isInterface();
199 if (implementor.isAbstract() || !implementor.isLeafClass()) {
200 AssumptionResult<ResolvedJavaType> leafConcreteSubtype = implementor.findLeafConcreteSubtype();
201 if (leafConcreteSubtype != null) {
202 assert !leafConcreteSubtype.getResult().equals(implementor);
203 AssumptionResult<ResolvedJavaType> newResult = new AssumptionResult<>(leafConcreteSubtype.getResult(), new ConcreteSubtype(this, implementor));
204 // Accumulate leaf assumptions and return the combined result.
205 newResult.add(leafConcreteSubtype);
206 return newResult;
207 }
208 return null;
209 }
210 return concreteSubtype(implementor);
211 } else {
212 HotSpotResolvedObjectTypeImpl type = this;
213 while (type.isAbstract()) {
214 HotSpotResolvedObjectTypeImpl subklass = type.getSubklass();
215 if (subklass == null || UNSAFE.getAddress(subklass.getMetaspaceKlass() + config.nextSiblingOffset) != 0) {
216 return null;
217 }
218 type = subklass;
219 }
220 if (type.isAbstract() || type.isInterface() || !type.isLeafClass()) {
221 return null;
222 }
223 if (this.isAbstract()) {
224 return concreteSubtype(type);
225 } else {
226 assert this.equals(type);
227 return new AssumptionResult<>(type, new LeafType(type));
228 }
229 }
230 }
231
232 private AssumptionResult<ResolvedJavaType> concreteSubtype(HotSpotResolvedObjectTypeImpl type) {
233 if (type.isLeaf()) {
234 return new AssumptionResult<>(type, new ConcreteSubtype(this, type));
235 } else {
236 return new AssumptionResult<>(type, new LeafType(type), new ConcreteSubtype(this, type));
237 }
238 }
239
240 /**
241 * Returns if type {@code type} is a leaf class. This is the case if the
242 * {@code Klass::_subklass} field of the underlying class is zero.
243 *
244 * @return true if the type is a leaf class
245 */
246 private boolean isLeafClass() {
247 return getSubklass() == null;
248 }
249
250 /**
251 * Returns the {@code Klass::_subklass} field of the underlying metaspace klass for the given
252 * type {@code type}.
253 *
254 * @return value of the subklass field as metaspace klass pointer
255 */
256 private HotSpotResolvedObjectTypeImpl getSubklass() {
257 return compilerToVM().getResolvedJavaType(this, config().subklassOffset, false);
258 }
259
260 @Override
261 public HotSpotResolvedObjectTypeImpl getSuperclass() {
262 Class<?> javaSuperclass = mirror().getSuperclass();
263 return javaSuperclass == null ? null : fromObjectClass(javaSuperclass);
264 }
265
266 @Override
267 public HotSpotResolvedObjectTypeImpl[] getInterfaces() {
268 if (interfaces == null) {
269 Class<?>[] javaInterfaces = mirror().getInterfaces();
270 HotSpotResolvedObjectTypeImpl[] result = new HotSpotResolvedObjectTypeImpl[javaInterfaces.length];
271 for (int i = 0; i < javaInterfaces.length; i++) {
272 result[i] = fromObjectClass(javaInterfaces[i]);
273 }
274 interfaces = result;
275 }
276 return interfaces;
277 }
278
279 @Override
280 public HotSpotResolvedObjectTypeImpl getSingleImplementor() {
281 if (!isInterface()) {
282 throw new JVMCIError("Cannot call getSingleImplementor() on a non-interface type: %s", this);
283 }
284 return compilerToVM().getImplementor(this);
285 }
286
287 public HotSpotResolvedObjectTypeImpl getSupertype() {
288 if (isArray()) {
289 ResolvedJavaType componentType = getComponentType();
290 if (mirror() == Object[].class || componentType.isPrimitive()) {
291 return fromObjectClass(Object.class);
292 }
293 return (HotSpotResolvedObjectTypeImpl) ((HotSpotResolvedObjectTypeImpl) componentType).getSupertype().getArrayClass();
294 }
295 if (isInterface()) {
296 return fromObjectClass(Object.class);
297 }
298 return getSuperclass();
299 }
300
301 @Override
302 public HotSpotResolvedObjectType findLeastCommonAncestor(ResolvedJavaType otherType) {
303 if (otherType.isPrimitive()) {
304 return null;
305 } else {
306 HotSpotResolvedObjectTypeImpl t1 = this;
307 HotSpotResolvedObjectTypeImpl t2 = (HotSpotResolvedObjectTypeImpl) otherType;
308 while (true) {
309 if (t1.isAssignableFrom(t2)) {
310 return t1;
311 }
312 if (t2.isAssignableFrom(t1)) {
313 return t2;
314 }
315 t1 = t1.getSupertype();
316 t2 = t2.getSupertype();
317 }
318 }
319 }
320
321 @Override
322 public AssumptionResult<Boolean> hasFinalizableSubclass() {
323 assert !isArray();
324 if (!compilerToVM().hasFinalizableSubclass(this)) {
325 return new AssumptionResult<>(false, new NoFinalizableSubclass(this));
326 }
327 return new AssumptionResult<>(true);
328 }
329
330 @Override
331 public boolean hasFinalizer() {
332 return (getAccessFlags() & config().jvmAccHasFinalizer) != 0;
333 }
334
335 @Override
336 public boolean isPrimitive() {
337 return false;
338 }
339
340 @Override
341 public boolean isArray() {
342 return mirror().isArray();
343 }
344
345 @Override
346 public boolean isInitialized() {
347 return isArray() ? true : getInitState() == config().instanceKlassStateFullyInitialized;
348 }
349
350 @Override
351 public boolean isLinked() {
352 return isArray() ? true : getInitState() >= config().instanceKlassStateLinked;
353 }
354
355 /**
356 * Returns the value of the state field {@code InstanceKlass::_init_state} of the metaspace
357 * klass.
358 *
359 * @return state field value of this type
360 */
361 private int getInitState() {
362 assert !isArray() : "_init_state only exists in InstanceKlass";
363 return UNSAFE.getByte(getMetaspaceKlass() + config().instanceKlassInitStateOffset) & 0xFF;
364 }
365
366 @Override
367 public void initialize() {
368 if (!isInitialized()) {
369 UNSAFE.ensureClassInitialized(mirror());
370 assert isInitialized();
371 }
372 }
373
374 @Override
375 public boolean isInstance(JavaConstant obj) {
376 if (obj.getJavaKind() == JavaKind.Object && !obj.isNull()) {
377 return mirror().isInstance(((HotSpotObjectConstantImpl) obj).object());
378 }
379 return false;
380 }
381
382 @Override
383 public boolean isInstanceClass() {
384 return !isArray() && !isInterface();
385 }
386
387 @Override
388 public boolean isInterface() {
389 return mirror().isInterface();
390 }
391
392 @Override
393 public boolean isAssignableFrom(ResolvedJavaType other) {
394 assert other != null;
395 if (other instanceof HotSpotResolvedObjectTypeImpl) {
396 HotSpotResolvedObjectTypeImpl otherType = (HotSpotResolvedObjectTypeImpl) other;
397 return mirror().isAssignableFrom(otherType.mirror());
398 }
399 return false;
400 }
401
402 @Override
403 public boolean isJavaLangObject() {
404 return javaClass.equals(Object.class);
405 }
406
407 @Override
408 public JavaKind getJavaKind() {
409 return JavaKind.Object;
410 }
411
412 @Override
413 public ResolvedJavaMethod resolveMethod(ResolvedJavaMethod method, ResolvedJavaType callerType) {
414 assert !callerType.isArray();
415 if (isInterface()) {
416 // Methods can only be resolved against concrete types
417 return null;
418 }
419 if (method.isConcrete() && method.getDeclaringClass().equals(this) && method.isPublic()) {
420 return method;
421 }
422 if (!method.getDeclaringClass().isAssignableFrom(this)) {
423 return null;
424 }
425 HotSpotResolvedJavaMethodImpl hotSpotMethod = (HotSpotResolvedJavaMethodImpl) method;
426 HotSpotResolvedObjectTypeImpl hotSpotCallerType = (HotSpotResolvedObjectTypeImpl) callerType;
427 return compilerToVM().resolveMethod(this, hotSpotMethod, hotSpotCallerType);
428 }
429
430 public HotSpotConstantPool getConstantPool() {
431 if (constantPool == null) {
432 constantPool = compilerToVM().getConstantPool(this, config().instanceKlassConstantsOffset);
433 }
434 return constantPool;
435 }
436
437 /**
438 * Gets the instance size of this type. If an instance of this type cannot be fast path
439 * allocated, then the returned value is negative (its absolute value gives the size). Must not
440 * be called if this is an array or interface type.
441 */
442 public int instanceSize() {
443 assert !isArray();
444 assert !isInterface();
445
446 HotSpotVMConfig config = config();
447 final int layoutHelper = layoutHelper();
448 assert layoutHelper > config.klassLayoutHelperNeutralValue : "must be instance";
449
450 // See: Klass::layout_helper_size_in_bytes
451 int size = layoutHelper & ~config.klassLayoutHelperInstanceSlowPathBit;
452
453 // See: Klass::layout_helper_needs_slow_path
454 boolean needsSlowPath = (layoutHelper & config.klassLayoutHelperInstanceSlowPathBit) != 0;
455
456 return needsSlowPath ? -size : size;
457 }
458
459 public int layoutHelper() {
460 HotSpotVMConfig config = config();
461 return UNSAFE.getInt(getMetaspaceKlass() + config.klassLayoutHelperOffset);
462 }
463
464 synchronized HotSpotResolvedJavaMethod createMethod(long metaspaceMethod) {
465 HotSpotResolvedJavaMethodImpl method = null;
466 if (methodCache == null) {
467 methodCache = new HashMap<>(8);
468 } else {
469 method = methodCache.get(metaspaceMethod);
470 }
471 if (method == null) {
472 method = new HotSpotResolvedJavaMethodImpl(this, metaspaceMethod);
473 methodCache.put(metaspaceMethod, method);
474 context.add(method);
475 }
476 return method;
477 }
478
479 public int getVtableLength() {
480 HotSpotVMConfig config = config();
481 if (isInterface() || isArray()) {
482 /* Everything has the core vtable of java.lang.Object */
483 return config.baseVtableLength();
484 }
485 int result = UNSAFE.getInt(getMetaspaceKlass() + config.klassVtableLengthOffset) / (config.vtableEntrySize / config.heapWordSize);
486 assert result >= config.baseVtableLength() : UNSAFE.getInt(getMetaspaceKlass() + config.klassVtableLengthOffset) + " " + config.vtableEntrySize;
487 return result;
488 }
489
490 synchronized HotSpotResolvedJavaField createField(String fieldName, JavaType type, long offset, int rawFlags) {
491 HotSpotResolvedJavaField result = null;
492
493 final int flags = rawFlags & ModifiersProvider.jvmFieldModifiers();
494
495 final long id = offset + ((long) flags << 32);
496
497 // Must cache the fields, because the local load elimination only works if the
498 // objects from two field lookups are identical.
499 if (fieldCache == null) {
500 fieldCache = new HashMap<>(8);
501 } else {
502 result = fieldCache.get(id);
503 }
504
505 if (result == null) {
506 result = new HotSpotResolvedJavaFieldImpl(this, fieldName, type, offset, rawFlags);
507 fieldCache.put(id, result);
508 } else {
509 assert result.getName().equals(fieldName);
510 /*
511 * Comparing the types directly is too strict, because the type in the cache could be
512 * resolved while the incoming type is unresolved. The name comparison is sufficient
513 * because the type will always be resolved in the context of the holder.
514 */
515 assert result.getType().getName().equals(type.getName());
516 assert result.offset() == offset;
517 assert result.getModifiers() == flags;
518 }
519
520 return result;
521 }
522
523 @Override
524 public AssumptionResult<ResolvedJavaMethod> findUniqueConcreteMethod(ResolvedJavaMethod method) {
525 HotSpotResolvedJavaMethod hmethod = (HotSpotResolvedJavaMethod) method;
526 HotSpotResolvedObjectType declaredHolder = hmethod.getDeclaringClass();
527 /*
528 * Sometimes the receiver type in the graph hasn't stabilized to a subtype of declared
529 * holder, usually because of phis, so make sure that the type is related to the declared
530 * type before using it for lookup. Unlinked types should also be ignored because we can't
531 * resolve the proper method to invoke. Generally unlinked types in invokes should result in
532 * a deopt instead since they can't really be used if they aren't linked yet.
533 */
534 if (!declaredHolder.isAssignableFrom(this) || this.isArray() || this.equals(declaredHolder) || !isLinked() || isInterface()) {
535 ResolvedJavaMethod result = hmethod.uniqueConcreteMethod(declaredHolder);
536 if (result != null) {
537 return new AssumptionResult<>(result, new ConcreteMethod(method, declaredHolder, result));
538 }
539 return null;
540 }
541 /*
542 * The holder may be a subtype of the declaredHolder so make sure to resolve the method to
543 * the correct method for the subtype.
544 */
545 HotSpotResolvedJavaMethod resolvedMethod = (HotSpotResolvedJavaMethod) resolveMethod(hmethod, this);
546 if (resolvedMethod == null) {
547 // The type isn't known to implement the method.
548 return null;
549 }
550
551 ResolvedJavaMethod result = resolvedMethod.uniqueConcreteMethod(this);
552 if (result != null) {
553 return new AssumptionResult<>(result, new ConcreteMethod(method, this, result));
554 }
555 return null;
556 }
557
558 /**
559 * This class represents the field information for one field contained in the fields array of an
560 * {@code InstanceKlass}. The implementation is similar to the native {@code FieldInfo} class.
561 */
562 private class FieldInfo {
563 /**
564 * Native pointer into the array of Java shorts.
565 */
566 private final long metaspaceData;
567
568 /**
569 * Creates a field info for the field in the fields array at index {@code index}.
570 *
571 * @param index index to the fields array
572 */
573 FieldInfo(int index) {
574 HotSpotVMConfig config = config();
575 // Get Klass::_fields
576 final long metaspaceFields = UNSAFE.getAddress(getMetaspaceKlass() + config.instanceKlassFieldsOffset);
577 assert config.fieldInfoFieldSlots == 6 : "revisit the field parsing code";
578 metaspaceData = metaspaceFields + config.arrayU2DataOffset + config.fieldInfoFieldSlots * Short.BYTES * index;
579 }
580
581 private int getAccessFlags() {
582 return readFieldSlot(config().fieldInfoAccessFlagsOffset);
583 }
584
585 private int getNameIndex() {
586 return readFieldSlot(config().fieldInfoNameIndexOffset);
587 }
588
589 private int getSignatureIndex() {
590 return readFieldSlot(config().fieldInfoSignatureIndexOffset);
591 }
592
593 public int getOffset() {
594 HotSpotVMConfig config = config();
595 final int lowPacked = readFieldSlot(config.fieldInfoLowPackedOffset);
596 final int highPacked = readFieldSlot(config.fieldInfoHighPackedOffset);
597 final int offset = ((highPacked << Short.SIZE) | lowPacked) >> config.fieldInfoTagSize;
598 return offset;
599 }
600
601 /**
602 * Helper method to read an entry (slot) from the field array. Currently field info is laid
603 * on top an array of Java shorts.
604 */
605 private int readFieldSlot(int index) {
606 return UNSAFE.getChar(metaspaceData + Short.BYTES * index);
607 }
608
609 /**
610 * Returns the name of this field as a {@link String}. If the field is an internal field the
611 * name index is pointing into the vmSymbols table.
612 */
613 public String getName() {
614 final int nameIndex = getNameIndex();
615 return isInternal() ? HotSpotVmSymbols.symbolAt(nameIndex) : getConstantPool().lookupUtf8(nameIndex);
616 }
617
618 /**
619 * Returns the signature of this field as {@link String}. If the field is an internal field
620 * the signature index is pointing into the vmSymbols table.
621 */
622 public String getSignature() {
623 final int signatureIndex = getSignatureIndex();
624 return isInternal() ? HotSpotVmSymbols.symbolAt(signatureIndex) : getConstantPool().lookupUtf8(signatureIndex);
625 }
626
627 public JavaType getType() {
628 String signature = getSignature();
629 return runtime().lookupType(signature, HotSpotResolvedObjectTypeImpl.this, false);
630 }
631
632 private boolean isInternal() {
633 return (getAccessFlags() & config().jvmAccFieldInternal) != 0;
634 }
635
636 public boolean isStatic() {
637 return Modifier.isStatic(getAccessFlags());
638 }
639
640 public boolean hasGenericSignature() {
641 return (getAccessFlags() & config().jvmAccFieldHasGenericSignature) != 0;
642 }
643 }
644
645 private static class OffsetComparator implements java.util.Comparator<HotSpotResolvedJavaField> {
646 @Override
647 public int compare(HotSpotResolvedJavaField o1, HotSpotResolvedJavaField o2) {
648 return o1.offset() - o2.offset();
649 }
650 }
651
652 @Override
653 public ResolvedJavaField[] getInstanceFields(boolean includeSuperclasses) {
654 if (instanceFields == null) {
655 if (isArray() || isInterface()) {
656 instanceFields = new HotSpotResolvedJavaField[0];
657 } else {
658 final int fieldCount = getFieldCount();
659 ArrayList<HotSpotResolvedJavaField> fieldsArray = new ArrayList<>(fieldCount);
660
661 for (int i = 0; i < fieldCount; i++) {
662 FieldInfo field = new FieldInfo(i);
663
664 // We are only interested in instance fields.
665 if (!field.isStatic()) {
666 HotSpotResolvedJavaField resolvedJavaField = createField(field.getName(), field.getType(), field.getOffset(), field.getAccessFlags());
667 fieldsArray.add(resolvedJavaField);
668 }
669 }
670
671 fieldsArray.sort(new OffsetComparator());
672
673 HotSpotResolvedJavaField[] myFields = fieldsArray.toArray(new HotSpotResolvedJavaField[0]);
674
675 if (mirror() != Object.class) {
676 HotSpotResolvedJavaField[] superFields = (HotSpotResolvedJavaField[]) getSuperclass().getInstanceFields(true);
677 HotSpotResolvedJavaField[] fields = Arrays.copyOf(superFields, superFields.length + myFields.length);
678 System.arraycopy(myFields, 0, fields, superFields.length, myFields.length);
679 instanceFields = fields;
680 } else {
681 assert myFields.length == 0 : "java.lang.Object has fields!";
682 instanceFields = myFields;
683 }
684
685 }
686 }
687 if (!includeSuperclasses) {
688 int myFieldsStart = 0;
689 while (myFieldsStart < instanceFields.length && !instanceFields[myFieldsStart].getDeclaringClass().equals(this)) {
690 myFieldsStart++;
691 }
692 if (myFieldsStart == 0) {
693 return instanceFields;
694 }
695 if (myFieldsStart == instanceFields.length) {
696 return new HotSpotResolvedJavaField[0];
697 }
698 return Arrays.copyOfRange(instanceFields, myFieldsStart, instanceFields.length);
699 }
700 return instanceFields;
701 }
702
703 @Override
704 public ResolvedJavaField[] getStaticFields() {
705 if (isArray()) {
706 return new HotSpotResolvedJavaField[0];
707 } else {
708 final int fieldCount = getFieldCount();
709 ArrayList<HotSpotResolvedJavaField> fieldsArray = new ArrayList<>(fieldCount);
710
711 for (int i = 0; i < fieldCount; i++) {
712 FieldInfo field = new FieldInfo(i);
713
714 // We are only interested in static fields.
715 if (field.isStatic()) {
716 HotSpotResolvedJavaField resolvedJavaField = createField(field.getName(), field.getType(), field.getOffset(), field.getAccessFlags());
717 fieldsArray.add(resolvedJavaField);
718 }
719 }
720
721 fieldsArray.sort(new OffsetComparator());
722 return fieldsArray.toArray(new HotSpotResolvedJavaField[fieldsArray.size()]);
723 }
724 }
725
726 /**
727 * Returns the actual field count of this class's internal {@code InstanceKlass::_fields} array
728 * by walking the array and discounting the generic signature slots at the end of the array.
729 *
730 * <p>
731 * See {@code FieldStreamBase::init_generic_signature_start_slot}
732 */
733 private int getFieldCount() {
734 HotSpotVMConfig config = config();
735 final long metaspaceFields = UNSAFE.getAddress(getMetaspaceKlass() + config.instanceKlassFieldsOffset);
736 int metaspaceFieldsLength = UNSAFE.getInt(metaspaceFields + config.arrayU1LengthOffset);
737 int fieldCount = 0;
738
739 for (int i = 0, index = 0; i < metaspaceFieldsLength; i += config.fieldInfoFieldSlots, index++) {
740 FieldInfo field = new FieldInfo(index);
741 if (field.hasGenericSignature()) {
742 metaspaceFieldsLength--;
743 }
744 fieldCount++;
745 }
746 return fieldCount;
747 }
748
749 @Override
750 public Class<?> mirror() {
751 return javaClass;
752 }
753
754 @Override
755 public String getSourceFileName() {
756 HotSpotVMConfig config = config();
757 final int sourceFileNameIndex = UNSAFE.getChar(getMetaspaceKlass() + config.instanceKlassSourceFileNameIndexOffset);
758 if (sourceFileNameIndex == 0) {
759 return null;
760 }
761 return getConstantPool().lookupUtf8(sourceFileNameIndex);
762 }
763
764 @Override
765 public Annotation[] getAnnotations() {
766 return mirror().getAnnotations();
767 }
768
769 @Override
770 public Annotation[] getDeclaredAnnotations() {
771 return mirror().getDeclaredAnnotations();
772 }
773
774 @Override
775 public <T extends Annotation> T getAnnotation(Class<T> annotationClass) {
776 return mirror().getAnnotation(annotationClass);
777 }
778
779 /**
780 * Performs a fast-path check that this type is resolved in the context of a given accessing
781 * class. A negative result does not mean this type is not resolved with respect to
782 * {@code accessingClass}. That can only be determined by
783 * {@linkplain HotSpotJVMCIRuntime#lookupType(String, HotSpotResolvedObjectType, boolean)
784 * re-resolving} the type.
785 */
786 public boolean isDefinitelyResolvedWithRespectTo(ResolvedJavaType accessingClass) {
787 assert accessingClass != null;
788 ResolvedJavaType elementType = getElementalType();
789 if (elementType.isPrimitive()) {
790 // Primitive type resolution is context free.
791 return true;
792 }
793 if (elementType.getName().startsWith("Ljava/")) {
794 // Classes in a java.* package can only be defined by the
795 // boot class loader. This is enforced by ClassLoader.preDefineClass()
796 assert mirror().getClassLoader() == null;
797 return true;
798 }
799 ClassLoader thisCl = mirror().getClassLoader();
800 ClassLoader accessingClassCl = ((HotSpotResolvedObjectTypeImpl) accessingClass).mirror().getClassLoader();
801 return thisCl == accessingClassCl;
802 }
803
804 @Override
805 public ResolvedJavaType resolve(ResolvedJavaType accessingClass) {
806 if (isDefinitelyResolvedWithRespectTo(requireNonNull(accessingClass))) {
807 return this;
808 }
809 HotSpotResolvedObjectTypeImpl accessingType = (HotSpotResolvedObjectTypeImpl) accessingClass;
810 return (ResolvedJavaType) runtime().lookupType(getName(), accessingType, true);
811 }
812
813 /**
814 * Gets the metaspace Klass boxed in a {@link JavaConstant}.
815 */
816 public Constant klass() {
817 return HotSpotMetaspaceConstantImpl.forMetaspaceObject(this, false);
818 }
819
820 public boolean isPrimaryType() {
821 return config().secondarySuperCacheOffset != superCheckOffset();
822 }
823
824 public int superCheckOffset() {
825 HotSpotVMConfig config = config();
826 return UNSAFE.getInt(getMetaspaceKlass() + config.superCheckOffsetOffset);
827 }
828
829 public long prototypeMarkWord() {
830 HotSpotVMConfig config = config();
831 if (isArray()) {
832 return config.arrayPrototypeMarkWord();
833 } else {
834 return UNSAFE.getAddress(getMetaspaceKlass() + config.prototypeMarkWordOffset);
835 }
836 }
837
838 @Override
839 public ResolvedJavaField findInstanceFieldWithOffset(long offset, JavaKind expectedEntryKind) {
840 ResolvedJavaField[] declaredFields = getInstanceFields(true);
841 for (ResolvedJavaField field : declaredFields) {
842 HotSpotResolvedJavaField resolvedField = (HotSpotResolvedJavaField) field;
843 long resolvedFieldOffset = resolvedField.offset();
844 // @formatter:off
845 if (ByteOrder.nativeOrder() == ByteOrder.BIG_ENDIAN &&
846 expectedEntryKind.isPrimitive() &&
847 !expectedEntryKind.equals(JavaKind.Void) &&
848 resolvedField.getJavaKind().isPrimitive()) {
849 resolvedFieldOffset +=
850 resolvedField.getJavaKind().getByteCount() -
851 Math.min(resolvedField.getJavaKind().getByteCount(), 4 + expectedEntryKind.getByteCount());
852 }
853 if (resolvedFieldOffset == offset) {
854 return field;
855 }
856 // @formatter:on
857 }
858 return null;
859 }
860
861 @Override
862 public boolean isLocal() {
863 return mirror().isLocalClass();
864 }
865
866 @Override
867 public boolean isMember() {
868 return mirror().isMemberClass();
869 }
870
871 @Override
872 public HotSpotResolvedObjectTypeImpl getEnclosingType() {
873 final Class<?> encl = mirror().getEnclosingClass();
874 return encl == null ? null : fromObjectClass(encl);
875 }
876
877 @Override
878 public ResolvedJavaMethod[] getDeclaredConstructors() {
879 Constructor<?>[] constructors = mirror().getDeclaredConstructors();
880 ResolvedJavaMethod[] result = new ResolvedJavaMethod[constructors.length];
881 for (int i = 0; i < constructors.length; i++) {
882 result[i] = runtime().getHostJVMCIBackend().getMetaAccess().lookupJavaMethod(constructors[i]);
883 assert result[i].isConstructor();
884 }
885 return result;
886 }
887
888 @Override
889 public ResolvedJavaMethod[] getDeclaredMethods() {
890 Method[] methods = mirror().getDeclaredMethods();
891 ResolvedJavaMethod[] result = new ResolvedJavaMethod[methods.length];
892 for (int i = 0; i < methods.length; i++) {
893 result[i] = runtime().getHostJVMCIBackend().getMetaAccess().lookupJavaMethod(methods[i]);
894 assert !result[i].isConstructor();
895 }
896 return result;
897 }
898
899 public ResolvedJavaMethod getClassInitializer() {
900 return compilerToVM().getClassInitializer(this);
901 }
902
903 @Override
904 public String toString() {
905 return "HotSpotType<" + getName() + ", resolved>";
906 }
907
908 @Override
909 public boolean isCloneableWithAllocation() {
910 return (getAccessFlags() & config().jvmAccIsCloneableFast) != 0;
911 }
912 }